Abstract

Acoustic sensors play a pivotal role in smart IoT systems and human-computer interaction interfaces. However, a critical challenge persists in reconciling high sensitivity with broad detection bandwidth. Inspired by the intricate morphology of moth wings, this study presents a flexible, self-powered multi-resonant acoustic sensor (MRAS) incorporating a bioinspired micro-nano isolated venation network structure (IVNS). The sensor design employs electrospun PAN nanofibers to emulate the chitinous vibrating membranes of moth wings, while a patterned copper-coated PET film replicates the ridge and microrib architecture, thereby establishing multiple resonant areas. Through systematic optimization of the IVNS geometry and PAN nanofiber alignment, the proposed sensor achieves remarkable performance enhancements: an extended bandwidth (50–3000 Hz, representing a 580 % increase relative to non-IVNS counterparts), superior electrical output (0.73 V at 110 dB, 183 % higher than conventional designs), and exceptional sensitivity (133.25 mV/Pa, a 397 % improvement over baseline sensors). Demonstrating robust performance in complex acoustic environments, the MRAS exhibits high fidelity in music and speech recognition tasks, underscoring its potential as a transformative platform for next-generation acoustic sensing technologies.